Filament non-woven fabric and manufacturing equipment thereof

Abstract

According to the filament non-woven fabric and the manufacturing equipment thereof, the filament non-woven fabric is a fiber net composed of curled filament fibers with a spiral structure, the curled filament fibers are composed of high-melting-point resin and low-melting-point resin, the melting point difference of the high-melting-point resin and the low-melting-point resin is at least 20 DEG C, and at least part of the surface layer of each curled filament fiber is the low-melting-point resin. The low-melting-point resins on the surface layers of the adjacent curled filament fibers are mutually fused and bonded together, and the fluctuation ratio of the air permeability at different positions on the filament non-woven fabric is not more than 10%. Due to the fact that the curled filament fiber net is conveyed to the conveying net curtain or other fiber nets along with rotation of the rotary net, the impact force generated when the curled filament fiber net directly falls to the conveying net curtain or the previous fiber net is reduced, and the defects that fibers at different positions of the formed filament non-woven fabric are not evenly distributed, and the uniformity of the net face is poor can be overcome. Therefore, the filament non-woven fabric is uniform in mesh surface and has good air permeability and fluffiness.

Description

Technical Field

[0001] The utility model relates to the technical field of non-woven fabrics, in particular to a filament non-woven fabric used for personal care and infant care and a manufacturing device thereof. Background Art

[0002] Filament nonwoven fabrics are produced by melt-spinning thermoplastic resins. Due to their soft touch and low price, they are often used in sanitary napkins and diapers for personal care and infant care. To improve the fluffiness of filament nonwoven fabrics, bicomponent fibers composed of a low-melting-point thermoplastic resin and a high-melting-point thermoplastic resin are often used. The bicomponent fibers are heated by a heating device. Due to the different thermal shrinkage forces of the two components in the fiber, the fibers curl, thereby improving their fluffiness. However, during the heating process, the low-melting-point thermoplastic resin in the fiber melts, and adjacent fibers adhere together, which affects the curl and number of crimps of the bicomponent fibers, and does not significantly improve the fluffiness of the filament nonwoven fabric. Utility Model Content

[0003] The purpose of the utility model is to provide a filament non-woven fabric with good fluffiness and uniform mesh surface, so as to overcome the defects of existing products.

[0004] To achieve the above purpose, the solution of the utility model is:

[0005] A filament non-woven fabric, comprising a fiber web composed of helically structured curled filament fibers composed of a high-melting-point resin and a low-melting-point resin, the melting points of which differ by at least 20°C; the surface layer of the curled filament fibers is at least partially composed of the low-melting-point resin, and the low-melting-point resins on the surface layers of adjacent curled filament fibers are melted and bonded together, wherein: the curl rate of the curled filament fibers is 5% to 30%, the number of curls is 5 to 15 per centimeter, and the fluctuation rate of air permeability at different positions on the filament non-woven fabric is no more than 10%.

[0006] The curly filament fibers are eccentric structure filament fibers or parallel structure filament fibers.

[0007] The filament non-woven fabric has two or more layers of fiber webs, at least one of which is a fiber web composed of crimped filament fibers.

[0008] The fluctuation rate of air permeability at different positions on the filament non-woven fabric is no more than 5%.

[0009] The high melting point resin and the low melting point resin are polyethylene terephthalate (PET) and high density polyethylene (HDPE) respectively.

[0010] The high melting point resin and the low melting point resin are polypropylene PP and high density polyethylene HDPE respectively.

[0011] The utility model also provides a kind of manufacturing equipment of filament nonwoven fabric, including hot melt extrusion device, spinning device, side blowing cold air device, spinning draft device, round net forming machine, conveying device and heating device that are sequentially interconnected;

[0012] The hot melt extrusion device includes two screw extruders and is connected with the spinning device respectively.

[0013] The side blowing cold air device is located below the spinneret of the spinning device, the spinneret is provided with double-component spinning hole, and the side blowing cold air device is used for blowing side blowing cold air on both sides. The spinning draft device is located below the side blowing cold air device.

[0014] The conveying device is located below the round net forming machine, and the heating device is located on one side of the conveying device.

[0015] Further, the round net forming machine includes a round net and a negative pressure air suction device.

[0016] Further, the round net is a metal endless nickel net with an open hole structure on the surface.

[0017] Further, the double-component spinning hole is an eccentric structure spinning hole or a parallel structure spinning hole.

[0018] Further, the conveying device is a flat net forming machine or a conveying net curtain.

[0019] Further, the heating device is a hot air oven or a hot rolling roller.

[0020] Further, the conveying device is a conveying net curtain, the heating device is a hot air oven, and the conveying net curtain passes through the hot air oven.

[0021] A manufacturing method of filament nonwoven fabric, which includes the following specific manufacturing steps:

[0022] Step 1: Two thermoplastic resins with melting points at least 20° C. different from each other are heated separately in a screw extruder. After melting, the two resins enter a spinning device. In the spinning device, the high-temperature thermoplastic resin melt is converted into a melt stream, which is then ejected through a two-component spinneret on a spinneret, cooled by side-blown cold air, and stretched through a spinning and stretching device to form filament fibers whose surface layer is at least partially composed of a low-melting-point resin; the filament fibers fall down in a relaxed state onto a cylinder net of a cylinder netting machine below the spinning and stretching device to form a filament fiber web. The filament fiber web leaves the negative pressure suction device of the cylinder netting machine as the cylinder net rotates to form a curled filament fiber web with a spiral structure, and is conveyed to a heating device, wherein the curled filament fibers constituting the curled filament fiber web have a curl rate of 5% to 30%, and a curl number of 5 to 15 per cm;

[0023] In step 2, the crimped filament fiber web is heated by a heating device, and the low-melting-point thermoplastic resin in the crimped filament fibers begins to melt and the fibers adhere to each other, thereby forming the filament non-woven fabric.

[0024] In the step 1, the two-component spinneret holes on the spinneret plate are eccentric structure spinnerets or parallel structure spinnerets.

[0025] The draft ratio of the filament fibers in the spinning and drawing device is ≥600.

[0026] The wind speed of the filament fibers when reaching the cylinder of the cylinder netting machine is 3m / s to 15m / s.

[0027] In the step 1, the spirally structured curly filament web is adsorbed on the flat web forming machine by the negative pressure suction device of the flat web forming machine in a relaxed state as the cylinder rotates, and then transferred to the heating device.

[0028] Before step 2, one or more layers of the curled filament web formed in step 1 are sequentially stacked on a conveying screen as the cylinder rotates to form a multi-layer curled filament web, which is then transferred to a heating device.

[0029] The cylinder screen of the cylinder screen forming machine in step 1 is a metal endless nickel screen with an open-pore structure on the surface.

[0030] The heating device in step 2 is a hot air oven or a hot rolling roller.

[0031] In step 1, the spirally structured curled filament web is transferred to the conveying screen as the cylinder rotates, and then transferred to the heating device through the conveying screen; in step 2, the heating device is a hot air oven; and the conveying screen passes through the hot air oven.

[0032] By using the above structure and manufacturing method, since the long filament fiber is oriented along the direction of the external force during the stretching process in the spinning draft device, and since the orientation degree and crystallinity of the different components of the thermoplastic resin in the long filament fiber are different, different internal stress and curling potential energy exist in the long filament fiber during the stretching process. Once the stretching is completed, when the long filament fiber falls on the rotating screen of the spinning draft device in the relaxed state, the curled long filament fiber web composed of the long filament fiber with the spiral structure is formed after leaving the negative pressure suction device. In this way, the problem that the low-melting-point resin in the long filament fiber is prone to adhere to the adjacent fibers during the curling process after the fiber is stretched and heated again, thereby affecting the curling degree and the number of curls of the long filament fiber, can be effectively prevented. In this way, the loftiness of the long filament non-woven fabric is improved. Meanwhile, the spinning device is a rotating screen spinning device, and the long filament fiber can be quickly changed from the stretched state to the rotating state with the rotating screen, so that the stress in the vertical direction is quickly eliminated, the formation of the spiral structure of the fiber is accelerated, the curled long filament fiber web is conveyed to the conveying screen or other fiber web while rotating with the rotating screen, the impact force of the curled long filament fiber web falling directly on the conveying screen or the previous fiber web is reduced, the curled long filament fiber web is prevented from being scattered due to the mutual collision of the fibers of the curled long filament fiber web and the previous fiber web when contacting the conveying screen or the previous fiber web, and the defect of uneven distribution of the fibers at different positions of the formed long filament non-woven fabric and poor uniformity of the web surface is avoided.

[0033] Therefore, the long filament non-woven fabric manufactured has a uniform web surface, good air permeability and loftiness. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 FIG. 1 is a schematic view of the long filament non-woven fabric in the embodiment 1 of the present application;

[0035] Figure 2 FIG. 2 is a schematic view of the manufacturing of the long filament non-woven fabric in the embodiment 1 of the present application;

[0036] Figure 3 FIG. 3 is a schematic view of the double-component spinneret in the embodiment 1 of the present application;

[0037] Figure 4 FIG. 5 is a schematic view of the manufacturing of the long filament non-woven fabric in the embodiment 2 of the present application;

[0038] Figure 5 FIG. 6 is a schematic view of the manufacturing of the long filament non-woven fabric in the embodiment 3 of the present application. DETAILED DESCRIPTION

[0039] In order to further explain the technical scheme of the present application, the present application will be described in detail below through specific embodiments.

[0040] The utility model discloses a filament non-woven fabric and a manufacturing device and a manufacturing method thereof.

[0041] like Figure 1 As shown, the filament non-woven fabric 1 includes a fiber web composed of curled filament fibers b with a spiral structure composed of a high-melting point resin and a low-melting point resin with a melting point difference of at least 20°C; the surface layer of the curled filament fibers b is at least partially low-melting point resin, and the low-melting point resins on the surface layers of adjacent curled filament fibers b are melted and bonded to each other.

[0042] The curl rate of the curled filament fibers may be 5% to 30%, the number of curls may be 5 to 15 per cm, and the fluctuation rate of the air permeability at different positions on the filament non-woven fabric is no more than 10%.

[0043] See also Figure 2 The utility model also provides a manufacturing device for filament non-woven fabrics, which includes a hot melt extrusion device, a spinning device B, a side-blowing cold air device (not shown), a spinning drafting device E, a cylinder forming machine F, a conveying device and a heating device that are sequentially connected to each other; the conveying device can be a flat mesh forming machine or a conveying mesh curtain I, and the heating device can be a hot air oven J or a hot calender roller.

[0044] The hot melt extrusion device includes two screw extruders A and A', which are respectively connected to the spinning device B;

[0045] The side-blowing cold air device is located below the spinneret C of the spinning device B. The spinneret C is provided with a double-component spinneret hole. Figure 3 The two-component spinneret can be an eccentric structure spinneret N1 or a parallel structure spinneret N2.

[0046] The side-blowing cold air device is used to blow out side-blowing cold air D on both sides; the spinning drafting device E is located below the side-blowing cold air device; the cylinder forming machine F is located below the spinning drafting device E;

[0047] The conveying device is located below the cylinder forming machine F, and the heating device is located on one side of the conveying device. The conveying device is used to convey the fiber web rotated and output by the cylinder forming machine F to the heating device for heating and forming.

[0048] The present invention will be further described below based on the above equipment in combination with a specific manufacturing method.

[0049] Example 1

[0050] Specific as Figures 2-3 As shown, the specific manufacturing steps of the manufacturing method are as follows:

[0051] Step 1: Two thermoplastic resins, high-density polyethylene (HDPE) and polypropylene (PP), with melting points at least 20°C apart, are heated in screw extruders A and A', respectively. After melting, they enter a spinning device B, where the high-temperature thermoplastic resin melt is converted into a thin stream of melt, which is then ejected through the two-component spinneret holes on a spinneret C. Figure 3 , wherein: the two-component spinneret is an eccentric structure spinneret N1 or a parallel structure spinneret N2, cooled by side-blown cold air D, and stretched by a spinning drafting device E to form filament fibers a whose surface layer is at least partially composed of a low-melting-point resin, wherein: the draft ratio of the filament fibers a is 600, and the filament fibers a fall down in a relaxed state on the cylinder H of a cylinder web-forming machine F below the spinning drafting device E to form a filament fiber web, and the filament fiber web rotates with the cylinder F and leaves the negative pressure suction device G of the cylinder web-forming machine F to form a curled filament fiber web b with a spiral structure, and is conveyed to a conveying mesh curtain I, wherein the wind speed of the filament fibers a when reaching the cylinder H of the cylinder web-forming machine F is 3 m / s, the curling rate of the curled filament fibers constituting the curled filament fiber web b is 5% to 30%, and the number of curls is 5 to 15 per cm;

[0052] In step 2, the curled filament web b is conveyed to the hot air oven J by passing through the conveying screen I of the hot air oven J for heating. The low-melting-point thermoplastic resin in the curled filament fibers begins to melt and the fibers adhere to each other to form the filament non-woven fabric 1.

[0053] Fiber curl and crimp number detection

[0054] Testing instrument: Curl elasticity tester YG362B

[0055] Test sample: Fiber bundle

[0056] Test steps: 1) Calibrate the instrument, use the upper clamp to take out a fiber, and use tweezers to place the other end of the fiber in the middle of the lower clamp jaws and clamp it.

[0057] 2) Turn the brake knob, apply a light load of 0.02 mN / dtex, and press the "Down" button. Wait until the balance light illuminates and the down light turns off. The display will show L0 (light load elongation). Turn the "25mm length pointer" on the top of the lower gripper and use the magnifying glass to calculate the number of crimps: (number of crimps on the left + number of crimps on the right) / 2.

[0058] 3) Turn the read button to apply a heavy load of 1.0 mN / dtex and press the "Down" key. The balance light will illuminate and the down light will go out. The J value shown on the display is the curl degree.

[0059] Using the above-mentioned fiber curl rate and curl number detection method, the curl number and degree of curl of filament fibers a after leaving the negative pressure suction device G of the cylinder web forming machine F were tested. The curl rate of the helical curled filament fibers was 20%, and the curl number was 10 / cm. Since the process of stretching the filament fibers in the spinning and drawing device is a process in which the filament fibers are oriented along the direction of the external force, and since the orientation and crystallinity of the different thermoplastic resin components in the filament fibers vary, different internal stresses and curling potentials exist in the filament fibers during the stretching process. Once the stretching is completed, the filament fibers fall in a relaxed state onto the cylinder H of the cylinder web forming machine F below the spinning and drawing device E, forming a helical curled filament web b after leaving the negative pressure suction device G. This eliminates the need for reheating the filament fibers for curling, thereby solving the problem of low-melting-point resins in the filament fibers easily adhering to adjacent fibers during the reheating process, thereby affecting the sufficient curling of the bicomponent fibers. At the same time, the curl degree of the filament fiber can be adjusted by adjusting the draft ratio of the filament fiber.

[0060] Breathability

[0061] Testing instrument: FX3300-Ⅳ air permeability tester.

[0062] 1. Set the area to 38cm 2 Install the clamp arm on the upper test head and connect the high pressure rubber tube to the test head. 2 Fix the lower test head in the specimen diameter setting circle and connect the high-pressure rubber tube to the lower test head.

[0063] 2. Set experimental conditions: select unit as: m 3 / m 2 *Minimum test pressure: 125 Pa.

[0064] 3. Place the front of the filament non-woven fabric flat on the lower test head, press the clamp arm to start the test, and when the indicator light of the correct test range tends to be stable and displays green, the reading is the air permeability of the filament non-woven fabric. Test the air permeability of different positions of the filament non-woven fabric, and record and calculate the air permeability fluctuation rate of the filament non-woven fabric.

[0065] Volatility (%) = standard deviation / mean × 100%

[0066] The test data is as follows:

[0067] Whether the non-woven fabric mesh is uniform is an important criterion for measuring the quality of non-woven fabrics. Since the thickness of filament non-woven fabrics is relatively low, the mesh uniformity of filament non-woven fabrics can be measured by testing the air permeability of different positions of the filament non-woven fabrics and calculating the fluctuation rate of the air permeability.

[0068] By using the test method of the air permeability fluctuation rate, the air permeability fluctuation rate of the filament nonwoven fabric at different positions in the embodiment 1 is only 3.30%, mainly because the crimped filament fiber web b is conveyed to the conveying net curtain I by rotating the rotary screen H, which reduces the impact force of the crimped filament fiber web b falling directly on the conveying net curtain I, prevents the crimped filament fiber web b from colliding with each other when contacting the conveying net curtain I and scattering the crimped filament fiber web b, and can avoid the defects of uneven fiber distribution and poor web uniformity of the formed filament nonwoven fabric 1 at different positions. And because of the existence of the rotary screen H, the filament fiber a can quickly change from the stretched state to rotate with the rotary screen H when falling on the rotary screen H, so as to quickly eliminate the vertical stress and accelerate the formation of the spiral structure of the fiber, and the rotary screen I is a metal endless nickel screen with an open hole structure on the surface, which is smooth and not easy to be stuck with filaments, preventing the filament fiber from being broken.

[0069] In addition, in the embodiment 1, the conveying net curtain I passes through the hot air oven J, and the fiber web does not need to be transferred to different conveying net curtains for multiple times, so that the formed filament nonwoven fabric is more uniform, and the hot air oven J is heated to make the fibers melt and adhere to each other through the low-melting-point resin on the surface of the crimped filament fiber to form the filament nonwoven fabric, greatly reducing the hot-rolling melting point area, and the formed filament nonwoven fabric has better air permeability.

[0070] Embodiment 2

[0071] As Figure 4 The utility model discloses a kind of filament nonwoven fabric and its manufacturing method, and specific manufacturing steps are as follows:

[0072] Step 1: Two thermoplastic resins, high-density polyethylene (HDPE) and polyethylene terephthalate (PET), with a melting point difference of at least 20°C, are heated in screw extruders A and A', respectively, and after melting, enter a spinning device B. In the spinning device B, the high-temperature thermoplastic resin melt is converted into a melt stream, and then ejected through a two-component spinneret on a spinneret C, wherein: the two-component spinneret can be an eccentric structure spinneret or a parallel structure spinneret, cooled by side blowing cold air D, and stretched through a spinning stretching device E to form a filament fiber a whose surface layer is at least partially a low-melting-point resin, wherein: the draft ratio of the filament fiber is 720, and the filament fiber a is in a relaxed state. The filaments a fall down in a relaxed state onto the cylinder H of a cylinder web-forming machine F below a spinning and drawing device E to form a filament web. The filament web leaves the negative pressure suction device G of the cylinder web-forming machine F as the cylinder web F rotates to form a curled filament web b having a spiral structure. The curled filament web b rotates with the cylinder web H and then passes through the negative pressure suction device L in the flat web-forming machine K in a relaxed state to be adsorbed on the flat web-forming machine K and transferred to a heating device. The wind speed of the filament fibers a when reaching the cylinder H of the cylinder web-forming machine F is 8 m / s. The curling rate of the curled filament fibers constituting the curled filament web b is 25%, and the number of curls is 15 per cm.

[0073] In step 2, the curled filament web b is transferred to the hot rolling roller M located behind the flat mesh web forming machine K for hot rolling. The low-melting-point thermoplastic resin in the curled filament fibers begins to melt and the fibers adhere to each other. At the same time, the curled filament web b is hot-pressed under the action of the hot rolling roller to form a plurality of hot-rolling point consolidated mesh surfaces, thereby forming the filament non-woven fabric 1.

[0074] The air permeability at different positions of the filament nonwoven fabric 1 in Example 2 was measured and the fluctuation rate was calculated. The test results are as follows:

[0075]

[0076] In the present embodiment 2, filament fiber a is formed into the curled filament web b consisting of filament fibers with a spiral structure after the cylinder web forming machine F, and then the curled filament web b is transported to the heating device after entering the flat web forming machine K in a relaxed state as the cylinder rotates. The flat web forming machine K not only positions and transmits the fibers on the mesh belt surface according to a predetermined distribution pattern, but also enables the curled filament web b to fully relax and curl, so that the curl and curl number formed are larger, so that the filament non-woven fabric formed is more fluffy. In addition, the hot rolling roller is adopted to form the fixed web, and the surface has a hot rolling point, so that the bonding strength of the filament non-woven fabric is larger, and the mechanical property of the non-woven fabric is better, but the air permeability of the filament non-woven fabric can be reduced. Of course, a hot air drying oven can also be used to form the curled fiber web, so that the fluffiness of the filament non-woven fabric can be better improved, and the air permeability of the filament non-woven fabric is not affected.

[0077] Example 3

[0078] As Figure 5 shown, the utility model discloses a kind of long filament nonwoven fabric and its manufacturing method, specific manufacturing steps are as follows:

[0079] (1) the two thermoplastic resins high-density polyethylene HDPE and polypropylene PP of at least 20 ℃ difference in melting point are heated respectively in screw extruder A1, A1', melt after entering spinning device B1, the melt of high-temperature thermoplastic resin becomes melt stream in spinning device B1, then is sprayed out through the double-component spinneret hole of spinneret C1, wherein: double-component spinneret hole is eccentric structure spinneret hole or parallel structure spinneret hole, side-blowing cold air D1 is cooled, and is stretched to form the long filament fiber a of at least part of low melting point resin in surface layer by spinning draft device E1, wherein: the draft ratio of long filament fiber is 680, the long filament fiber a falls in the upper long filament fiber web of flat screen forming machine K below spinning draft device E in relaxed state, and long filament fiber web forms the crimped long filament fiber web b1 with spiral structure after leaving the negative pressure suction device L of flat screen forming machine K, and is conveyed to conveying screen curtain I, wherein, the air speed of the long filament fiber a1 reaches the screen curtain of flat screen forming machine K is 12m / s, and the crimping rate of crimped long filament fiber constituting crimped long filament fiber web b1 is 5%, and the crimping number is 8 per cm;

[0080] (2) the two thermoplastic resins high-density polyethylene HDPE and polyethylene terephthalate PET of at least 20 ℃ difference in melting point are heated respectively in screw extruder A, A', melt after entering spinning device B, the melt of high-temperature thermoplastic resin becomes melt stream in spinning device B, then is sprayed out through the double-component spinneret hole of spinneret C, wherein: double-component spinneret hole is eccentric structure spinneret hole or parallel structure spinneret hole, side-blowing cold air D is cooled, and is stretched to form the long filament fiber a of at least part of low melting point resin in surface layer by spinning draft device E, wherein: the draft ratio of long filament fiber is 720, the long filament fiber a falls in the upper round screen H of round screen forming machine F below spinning draft device E in relaxed state and forms long filament fiber web, and long filament fiber web forms crimped long filament fiber web b with spiral structure after the negative pressure suction device G of round screen forming machine F is left with round screen F rotation, and crimped long filament fiber web b is stacked on the previous crimped long filament fiber web b1 on conveying screen curtain I with round screen rotation, forms multilayer crimped long filament fiber web, and is conveyed to heating device, wherein, the air speed of the long filament fiber a reaches the round screen H of round screen forming machine F is 15m / s, and the crimping rate of crimped long filament fiber constituting crimped long filament fiber web b is 15%, and the crimping number is 10 per cm;

[0081] (3) The multi-layer crimped filament fiber web is formed by hot rolling through the hot rolling roller M, the low-melting point thermoplastic resin in the crimped filament fiber starts to melt and the fibers are adhered to each other, and the crimped filament fiber web b is hot-pressed to form several hot-rolled point fixed web surfaces under the action of the hot rolling roller, thereby forming the filament non-woven fabric 1.

[0082] The air permeability of the filament non-woven fabric 1 at different positions in this embodiment 3 is measured and the fluctuation rate is calculated, and the test results are as follows:

[0083]

[0084] With the above structure and manufacturing method, since the crimped filament fiber web b is formed by the circular web forming machine F to form a uniform and continuous fiber web from the disordered filament fibers and then compounded with the previous crimped filament fiber web b1, the circular web forming machine F not only positions and transmits the fibers on the web belt surface according to the predetermined distribution rule, but also separates the filament fibers from the draft airflow, thereby reducing the interference of the draft airflow in the spinning process on the crimped filament fiber web b1 to effectively prevent the crimped filament fiber web b1 from being blown apart by the draft airflow in the spinning process, so as to ensure that the filament non-woven fabric web surface formed has good uniformity and bulkiness.

[0085] With the above manufacturing method, a multi-layer filament non-woven fabric can be manufactured, the previous crimped filament fiber web b1 can be formed by the flat web forming machine K or the circular web forming machine (in this embodiment, the flat web forming machine K is taken as an example), and the crimped filament fiber webs of the second layer and above are respectively formed by the corresponding circular web forming machines to form uniform and continuous fiber webs from the disordered filament fibers, and then are sequentially stacked on the previous crimped filament fiber web in a relaxed state to form a multi-layer crimped filament fiber web by rotating the circular web, which is conveyed and stacked on other fiber webs by rotating the circular web, thereby reducing the impact force of the crimped filament fiber web directly falling on the previous fiber web and preventing the crimped filament fiber web from colliding with each other when contacting the previous fiber web to scatter the fibers of the previous fiber web, so as to effectively solve the problem of uneven distribution of fibers at different positions of the multi-layer filament non-woven fabric formed and poor web uniformity.

[0086] In addition, the resins used in the two crimped filament fiber webs b and b1 of the filament non-woven fabric 1 in this embodiment 3 can be selected according to the specific application of the non-woven fabric, and in this embodiment 3, the crimped filament fiber web b1 uses HDPE / PP and the crimped filament fiber web b uses HDPE / PET. Since the fibers formed by HDPE / PP are softer, and the fibers formed by HDPE / PET have a certain stiffness, the surface of the filament non-woven fabric 1 formed is softer and has better bulkiness.

Claims

1. A filament nonwoven fabric, characterized in that: The filament non-woven fabric comprises a fiber web composed of spirally structured curled filament fibers composed of a high-melting-point resin and a low-melting-point resin with a melting point difference of at least 20°C; the surface layer of the curled filament fibers is at least partially low-melting-point resin, and the low-melting-point resins on the surface layers of adjacent curled filament fibers are melted and bonded together, wherein: the curl rate of the curled filament fibers is 5% to 30%, the number of curls is 5 to 15 per cm, and the fluctuation rate of the air permeability at different positions on the filament non-woven fabric is no more than 10%.

2. The filament nonwoven fabric according to claim 1, wherein: The curled filament fibers are eccentric structure filament fibers or parallel structure filament fibers; the high melting point resin and the low melting point resin are polyethylene terephthalate (PET) and high density polyethylene (HDPE), or polypropylene (PP) and high density polyethylene (HDPE).

3. The filament nonwoven fabric according to claim 1, wherein: The filament non-woven fabric has two or more layers of fiber webs, at least one of which is a fiber web composed of curled filament fibers; the fluctuation rate of air permeability at different positions on the filament non-woven fabric is no more than 5%.

4. A manufacturing device for a filament nonwoven fabric, used for manufacturing a filament nonwoven fabric according to any one of claims 1 to 3, characterized in that: It includes a hot melt extrusion device, a spinning device, a side-blowing cold air device, a spinning drafting device, a cylinder forming machine, a conveying device and a heating device which are connected to each other in sequence; The hot melt extrusion device includes two screw extruders, which are respectively connected to the spinning device; The side-blowing cold air device is located below the spinneret of the spinning device, the spinneret is provided with a two-component spinneret hole, and the side-blowing cold air device is used to blow side-blowing cold air from both sides; the spinning drafting device is located below the side-blowing cold air device; the cylinder forming machine is located below the spinning drafting device; The conveying device is located below the cylinder forming machine, and the heating device is located on one side of the conveying device. The conveying device is used to convey the fiber web composed of curly filament fibers with a spiral structure rotated and output by the cylinder forming machine to the heating device for heating and forming.

5. The manufacturing equipment for filament nonwoven fabric according to claim 4, characterized in that: The cylinder forming machine includes a cylinder and a negative pressure suction device; the cylinder can be rotatably arranged below the spinning and stretching device, and the negative pressure suction device is fixed inside the cylinder and is located directly below the spinning and stretching device.

6. The manufacturing equipment for filament nonwoven fabric according to claim 5, characterized in that: The circular mesh is a metal endless nickel mesh with an open-pore structure on the surface.

7. The manufacturing equipment for filament nonwoven fabric according to claim 4, characterized in that: The two-component spinneret holes are eccentric structure spinnerets or parallel structure spinnerets.

8. The manufacturing equipment for filament nonwoven fabric according to claim 4, characterized in that: The conveying device is a flat mesh forming machine or a conveying mesh curtain.

9. The manufacturing equipment for filament nonwoven fabric according to claim 4, characterized in that: The heating device is a hot air oven or a hot roller.

10. The manufacturing equipment for filament nonwoven fabric according to claim 4, characterized in that: The conveying device is a conveying mesh curtain, the heating device is a hot air oven, and the conveying mesh curtain passes through the hot air oven.

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